Purpose of this study is to investigate the prevalence and distribution of congenitally missing permanent
teeth (CMT) in a Turkish orthodontic patient population.
Panoramic radiographs, intraoral
photographs and dental casts of 2761 patients (females 1677, males 1084) aged from 9 to 46 who underwent orthodontic
treatment at Selcuk University Department of Orthodontics from 1990 to 2005 were retrospectively reviewed for CMT. A
comprehensive chart review was conducted in all subjects. Patient and treatment-related data were registered in a computer
database for comparative analysis.
When missing third molar data were included, prevalence of CMT in the
overall population was 30.64 with no significant differences between male and female patients (p=0.546). On the
other hand, prevalence of CMT excluding third molars was 6.77 with a significantly higher prevalence in females
compared to male patients (7.63 vs. 5.44, p=0.030). The most commonly congenitally missing tooth types in
decreasing order were the third molars followed by maxillary lateral incisors and mandibular second premolars. The majority
of missing third molars were located in the maxilla (55.7) with no significant gender differences (p=0.334).
58.4 of CMT excluding third molars in females were located in the maxilla compared to only 40.8 in males
(p=0.001). In both gender groups, majority of CMT excluding third molars were located in the anterior segment (55.6
and 58.4 in male and female patients respectively, p=0.713).
The most commonly congenitally
missing tooth type is third molars followed by maxillary lateral incisors and mandibular second premolars in our population.
Although there were no gender differences in prevalence and anatomical distribution of missing third molars, CMT excluding
third molars was significantly more prevalent in females with predominantly maxillary distribution in our
Vol.12 – n.2/2011
Harvard: A. Topkara, Z. Sari (2011) "Prevalence and distribution of hypodontia in a Turkish orthodontic patient population: results from a large academic cohort", European Journal of Paediatric Dentistry, 12(2), pp123-127. doi:
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